What is CapsHook.exe?

The genuine CapsHook.exe file is a software component of ASUS Eee PC by ASUS.
ASUS Eee PC is a brand of lightweight netbooks developed by ASUS in 2007. CapsHook.exe launches a process that provides a notification in the system tray when the Caps Lock is on. This is not an essential Windows process and can be disabled if known to create problems. ASUS Epee PC was developed as a lightweight system designed to mainly handle Internet applications,. It was powered by a Linux-based operating system, shipped with a solid-state drive (SSD), and was offered at a relatively small cost. Newer models of the ASUS Epee PC provided an option for Microsoft Windows operating systems and rotating media hard disk drives (HDD). ASUS is a Chinese personal computer vendor that manufactures everything from desktops and laptops to mobile phones, monitors, optical storage devices, and graphics cards. In 2013, it was the world's fifth largest computer seller, in terms of sales. The company began launching graphics cards in 2005 with their initial PhysX accelerator card. ASUS was founded in Taipei in 1989 by T.H. Tung, Ted Hsu, Wayne Hsieh and M.T. Liao, all previously employed by Acer. The company is currently headquartered in Taipei, Taiwan.

CapsHook stands for Capslock Notifier Hook

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the CapsHook.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

Click to Run a Free Scan for CapsHook.exe related errors

CapsHook.exe file information

Windows Task Manager with CapsHook
CapsHook.exe process in Windows Task Manager

The process known as CapsAndNumKeyNotify belongs to software Super Hybrid Engine or CapsAadNumNotify by ASUS (

Description: CapsHook.exe is not essential for Windows and will often cause problems. The CapsHook.exe file is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 445,344 bytes (87% of all occurrences), 439,712 bytes or 440,224 bytes. 
The program has no visible window. It is digitally signed. The file is able to record keyboard inputs. CapsHook.exe is not a Windows system file. The file is a Verisign signed file. CapsHook.exe is able to record keyboard and mouse inputs. Therefore the technical security rating is 73% dangerous, however you should also read the user reviews.

Uninstalling this variant: In the event of any problems with CapsHook.exe, you can uninstall the program using the Control Panel ⇒ Uninstall a ProgramSuper Hybrid Engine or CapsHook or consult's Customer Service for advice.

Recommended: Identify CapsHook.exe related errors

Important: Some malware camouflages itself as CapsHook.exe. Therefore, you should check the CapsHook.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

it comes with newer asus eee pc's, puts up a taskbar notice when caps lock is on

Summary: Average user rating of CapsHook.exe: based on 2 votes with 1 user comment. One user thinks CapsHook.exe is essential for Windows or an installed application. One user thinks CapsHook.exe is dangerous and recommends removing it.

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Best practices for resolving CapsHook issues

A clean and tidy computer is the key requirement for avoiding problems with CapsHook. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the CapsHook.exe process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

CapsHook.exe [all]